tree 747e3f5a5d6920dd5298c7859e0001468bff0ece
parent ddc44427f856c26030c363a45b2cdb97de3339d9
author Eric Fiselier <eric@efcs.ca> 1556240538 +0000
committer Eric Fiselier <eric@efcs.ca> 1556240538 +0000

Fix return type of std::tuple_cat.

When the arguments to tuple cat were const, the const was incorrectly
propagated into the type of the resulting tuple. For example:

const std::tuple<int> t(42);
auto r = std::tuple_cat(t, t);
// Incorrect! should be std::tuple<int, int>.
static_assert(is_same_v<decltype(r), std::tuple<const int, const int>>);

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@359255 91177308-0d34-0410-b5e6-96231b3b80d8